Implement web speech synthesis.

chrome/renderer/tts_dispatcher.cc

Index: chrome/renderer/tts_dispatcher.cc
diff --git a/chrome/renderer/tts_dispatcher.cc b/chrome/renderer/tts_dispatcher.cc
new file mode 100644
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+++ b/chrome/renderer/tts_dispatcher.cc
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+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/renderer/tts_dispatcher.h"
+
+#include "base/basictypes.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/common/tts_messages.h"
+#include "chrome/common/tts_utterance_request.h"
+#include "content/public/renderer/render_thread.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebCString.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebSpeechSynthesisUtterance.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebSpeechSynthesisVoice.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h"
+
+using content::RenderThread;
+using WebKit::WebSpeechSynthesizerClient;
+using WebKit::WebSpeechSynthesisUtterance;
+using WebKit::WebSpeechSynthesisVoice;
+using WebKit::WebString;
+using WebKit::WebVector;
+
+int TtsDispatcher::next_utterance_id_ = 1;
+
+TtsDispatcher::TtsDispatcher(WebSpeechSynthesizerClient* client)
+    : synthesizer_client_(client),
+      main_loop_(base::MessageLoopProxy::current()) {
+  RenderThread::Get()->AddFilter(this);
+}
+
+TtsDispatcher::~TtsDispatcher() {
+}
+
+bool TtsDispatcher::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(TtsDispatcher, message)
+    IPC_MESSAGE_HANDLER(TtsMsg_SetVoiceList, OnSetVoiceList)
+    IPC_MESSAGE_HANDLER(TtsMsg_DidStartSpeaking, OnDidStartSpeaking)
+    IPC_MESSAGE_HANDLER(TtsMsg_DidFinishSpeaking, OnDidFinishSpeaking)
+    IPC_MESSAGE_HANDLER(TtsMsg_DidPauseSpeaking, OnDidPauseSpeaking)
+    IPC_MESSAGE_HANDLER(TtsMsg_DidResumeSpeaking, OnDidResumeSpeaking)
+    IPC_MESSAGE_HANDLER(TtsMsg_WordBoundary, OnWordBoundary)
+    IPC_MESSAGE_HANDLER(TtsMsg_SentenceBoundary, OnSentenceBoundary)
+    IPC_MESSAGE_HANDLER(TtsMsg_MarkerEvent, OnMarkerEvent)
+    IPC_MESSAGE_HANDLER(TtsMsg_WasInterrupted, OnWasInterrupted)
+    IPC_MESSAGE_HANDLER(TtsMsg_WasCancelled, OnWasCancelled)
+    IPC_MESSAGE_HANDLER(TtsMsg_SpeakingErrorOccurred, OnSpeakingErrorOccurred)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void TtsDispatcher::updateVoiceList() {
+  RenderThread::Get()->Send(new TtsHostMsg_InitializeVoiceList());
+}
+
+void TtsDispatcher::speak(const WebSpeechSynthesisUtterance& web_utterance) {
+  int id = next_utterance_id_++;
+
+  utterance_id_map_[id] = web_utterance;
+
+  TtsUtteranceRequest utterance;
+  utterance.id = id;
+  utterance.text = web_utterance.text().utf8();
+  utterance.lang = web_utterance.lang().utf8();
+  utterance.voice = web_utterance.voice().utf8();
+  utterance.volume = web_utterance.volume();
+  utterance.rate = web_utterance.rate();
+  utterance.pitch = web_utterance.pitch();
+  RenderThread::Get()->Send(new TtsHostMsg_Speak(utterance));
+}
+
+void TtsDispatcher::pause() {
+  RenderThread::Get()->Send(new TtsHostMsg_Pause());
+}
+
+void TtsDispatcher::resume() {
+  RenderThread::Get()->Send(new TtsHostMsg_Resume());
+}
+
+void TtsDispatcher::cancel() {
+  RenderThread::Get()->Send(new TtsHostMsg_Cancel());
+}
+
+WebSpeechSynthesisUtterance TtsDispatcher::FindUtterance(int utterance_id) {
+  base::hash_map<int, WebSpeechSynthesisUtterance>::const_iterator iter =
+      utterance_id_map_.find(utterance_id);
+  if (iter == utterance_id_map_.end())
+    return WebSpeechSynthesisUtterance();
+  return iter->second;
+}
+
+void TtsDispatcher::OnSetVoiceList(const std::vector<TtsVoice>& voices) {
+  WebVector<WebSpeechSynthesisVoice> out_voices(voices.size());
+  for (size_t i = 0; i < voices.size(); ++i) {
+    out_voices[i] = WebSpeechSynthesisVoice();
+    out_voices[i].setVoiceURI(WebString::fromUTF8(voices[i].voice_uri));
+    out_voices[i].setName(WebString::fromUTF8(voices[i].name));
+    out_voices[i].setLanguage(WebString::fromUTF8(voices[i].lang));
+    out_voices[i].setIsLocalService(voices[i].local_service);
+    out_voices[i].setIsDefault(voices[i].is_default);
+  }
+  synthesizer_client_->setVoiceList(out_voices);
+}
+
+void TtsDispatcher::OnDidStartSpeaking(int utterance_id) {
+  if (utterance_id_map_.find(utterance_id) == utterance_id_map_.end())
+    return;
+
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->didStartSpeaking(utterance);
+}
+
+void TtsDispatcher::OnDidFinishSpeaking(int utterance_id) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->didFinishSpeaking(utterance);
+  utterance_id_map_.erase(utterance_id);
+}
+
+void TtsDispatcher::OnDidPauseSpeaking(int utterance_id) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->didPauseSpeaking(utterance);
+}
+
+void TtsDispatcher::OnDidResumeSpeaking(int utterance_id) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->didResumeSpeaking(utterance);
+}
+
+void TtsDispatcher::OnWordBoundary(int utterance_id, int char_index) {
+  CHECK(char_index >= 0);
+
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->wordBoundaryEventOccurred(
+      utterance, static_cast<unsigned>(char_index));
+}
+
+void TtsDispatcher::OnSentenceBoundary(int utterance_id, int char_index) {
+  CHECK(char_index >= 0);
+
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  synthesizer_client_->sentenceBoundaryEventOccurred(
+      utterance, static_cast<unsigned>(char_index));
+}
+
+void TtsDispatcher::OnMarkerEvent(int utterance_id, int char_index) {
+  // Not supported yet.
+}
+
+void TtsDispatcher::OnWasInterrupted(int utterance_id) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  // The web speech API doesn't support "interrupted".
+  synthesizer_client_->didFinishSpeaking(utterance);
+  utterance_id_map_.erase(utterance_id);
+}
+
+void TtsDispatcher::OnWasCancelled(int utterance_id) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  // The web speech API doesn't support "cancelled".
+  synthesizer_client_->didFinishSpeaking(utterance);
+  utterance_id_map_.erase(utterance_id);
+}
+
+void TtsDispatcher::OnSpeakingErrorOccurred(int utterance_id,
+                                            const std::string& error_message) {
+  WebSpeechSynthesisUtterance utterance = FindUtterance(utterance_id);
+  if (utterance.isNull())
+    return;
+
+  // The web speech API doesn't support an error message.
+  synthesizer_client_->speakingErrorOccurred(utterance);
+  utterance_id_map_.erase(utterance_id);
+}